What is the P0137 fault number? What is the Oxygen Sensor Circuit Low Voltage Bank 1, Sensor 2 malfunction description? How do you fix the P0137 fault code What are the causes and symptoms of the P0137 error code?
What is the P0137 Fault code? What does it all mean?
The fault code P0137 occurs when your vehicle’s maincomputer (PCM/ECM/ECU/ECU) detects an O2 sensor voltage signal below the pre-programmed parameters. This means that there is too much oxygen in the exhaust system and the engine is running in lean conditions. Bank 1 represents the cylinder 1 of the engine. Sensor 2 represents downstream O2 sensors after the catalytic converter.
There are two O2 sensors in your vehicle. The input sensor, also known by Sensor 1, is located prior to the catalytic converter. Sensor 2 is located after the catalytic converter.
You must first understand the O2 sensors’ workings in order to better understand code P0137. The sensor 1 upstream O2 sensors generate voltages that allow PCM to adjust air-fuel mixture from rich, lean, or vice versa. If the catalytic convert is properly functioning, however, downstream sensors (sensor 2) produce a steady voltage.
If the PCM detects a signal from Bank 2 that is lower than a specified value, code P0137 will trigger.
Note: P0137 is almost the same as P0136. P0137 codes indicate that the O2 sensor voltage has been sending a low voltage signal for longer than 2 minutes.
What Are the Possible Causes of the P0137 Fault code?
Common fault code P0137 can be found in many vehicle brands. The description of the fault code can vary from brand-to-brand. Toyota’s P0137 stands for Oxygen Sensor Circuit Low Voltage Banking 1, Sensor 2. It is called “Heated Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2” on Chevrolet vehicles. There are many possible causes, depending on your vehicle’s make and model.
- – Defective O2 sensor
- – Poor working condition
- – Problem with the O2 sensor circuit
- – A leaky exhaust
- – Blockage of the catalyst
- Engine misfire
- – High or low fuel pressure – fuel regulator or pump
- – Legacy PCM software
What are the symptoms of the P0137 Fault code?
Code P0137 usually only has one symptom: an illuminated check engine lamp.
- – Illumination for the check engine light
- – Leakage or bad odors coming from the exhaust
How to Fix the P0137 Fault Code
- – Replacing O2 sensor (Bank 1 / Sensor 2 )
- Repair or replace your O2 sensor cable or connector
- Clean the O2 sensor if it is contaminated with coolant or oil.
- – Fixing exhaust leaks prior to the sensor. This will allow stray air into the exhaust system, and low O2 sensor readings.
- – Make sure to inspect the O2 sensor that was removed for damage. Replace the catalyst if it is damaged.
How serious is the P0137 Fault code?
A faulty O2 sensor can cause the PCM to not properly control the engine fuel-air mixture. If ignored, the fault can lead to premature failure of certain engine components, failure of catalytic converters, reduced engine performance, and higher fuel consumption.
